Manual for Modbus P18 - London Electronics Ltd.
Contents
1. 3 displaying remaining time of a heater swit ched on 60 switching a heater on for Xn seconds Xn 32768 value from the range 60 32768 4022 reserved 32 6 6 Registers for readout Table 15 Value set in the two following 16 bit registers Registers contain the same data as 32 bit registers from the area 7500 The value is located in the 32 bit registers Name Write w readout r Unit Quantity name 7000 7002 7500 7501 C P18 D device identifier Measured temperature 7004 7502 Measured relative humidity 7006 7503 C Calculated dew point 7008 7504 g m Calculated absolute humi dity 7010 7505 min T C Min of temperature 7012 7506 max T C Max of temperature 7014 7016 7507 7508 min RH max RH Min of relative humidity Max of relative humidity 7018 7509 min DP C Min of dew point 33 7020 7510 maxDP r oc Max of dew point 7022 7511 minAH r g m Min of absolute humidity 7024 7512 maxAH r g m Max of absolute humidity 7026 7513 r oc Wet bulb temperature 7028 7514 r kPa Water vapor pressure Table 16 shows the registers of measuring values of the P18D transdu cer working in the registers 7000 and 7500 compatibility mode with the P14W transducer Table2. on RS 485 Switching on the internal heater indicator to dry the sensor 5 3 Functions of the P18D transducer capacitive button The P18D transducers are equipped with one capacitive button located on the housing The location of the button shows in Fig 8 KZ Fig 8 Location of the P18D transducer capacitive button 13 Capacitive button is used to e switch the display illumination on e change the presentation mode of the measurement results holding the button for about 2 seconds switches from automatic mode to manual mode or inversely e change the type of displayed values in the manual mode of presen tation of the measurement results pressing the button for a short time changes the displayed value program communication parameters address baud rate mode 5 4 Programming parameters menu of the P18D transducer Enter the programming menu by pressing and holding the capacitive button for approx 5 sec When entering the menu a first time changes direction marker is set to increasing the value next entry in the menu will cause the cyclic switching of the direction of changes 2 input in the menu will set the marker at v decreasing the value If the idle time exceeds 20 seconds the transducer will leave the menu and switch to displaying the measuring value Baud rate Mode Address Direction of changes Fig 9 The displ
3. 16 b S j 2 DB o O T On s S Bo E 682 s2 3 GI 0 5 G OG a Q 2 c EO S o oO 2 BSE Name E 2 o 2 por 8E oS S Qobe 3N 265 2 fe Se e 58 25 aw 2 gt D 7000 7500 ID o P18 D device iden tifier w R 7002 7501 T oc Measured tempera ture 7004 7502 DP oc Calculated dew point 7006 7503 7008 7504 RH Measured relative humidity 7010 7505 AH g m Calculated absolute humidity 7012 7506 7014 7507 7016 7508 7018 7509 min T oc Min of temperature 7020 7510 max T oc Max of temperature 7022 7511 min DP oc Min of dew point 7024 7512 max DP oc Max of dew point 7026 7513 3 7028 7514 7030 7515 min RH 5 Min of relative si humidity 7032 7516 max RH d Max of relative m humidity 7034 7517 min AH Im Min of absolute gm humidity 7036 7518 max AH 3 Max of absolute g m humidity 35 6 7 Emergency restoration of default parameters If the communication parameters have been changed and the new configuration is lost you can use the jumper marked ZW on the transmitter s board to set the temporary communication parameters address 247 baud rate 9600 kb s mode RTU 8N2 You can connect to the transmitter after setting the temporary parame ters and adjust them or restor
4. is located in the 32 bit register Registers contain measured and calculated data by the transducer Registers are only for readout 26 6 5 Registers for writing and readout Table 14 or 2 G V 2 OG 23 8 Ys o inti oa Name Range Description 20 ES gt SE L fs Ege 4000 Identifier wi 180 P18 device identifier i 204 P18D device identifier 4001 Address w 1 247 Device address r 4002 RS 485 0 5 Va Description baud rate lue 0 4800 bit s 1 9600 bit s 2 19200 bit s 3 38400 bit s 4 57600 bit s 5 115200 bit s 4003 RS 485 0 3 Va Description transmis lue sion mode 0 RTU 8N1 1 RTU 8N2 2 RTU 8E1 3 RTU 801 ot 4004 Confir 0 544 Va Description mation lue of trans mission 0 No change SARA ts 1 Confirmation of changes 4005 Averaging w 6 3600 Averaging time of the mea time r surement s 4006 Erasing w 0 1 Va Description the extre r lue mes 0 No change 1 Erasing the min and max values 4007 X1 of out w 32768 Value controlling out put 1 r 32767 g put 1 point X1 x100 4008 Y1 of out w 32768 B Expected value of put 1 r 32767 a output 1 for point X1 4009 X2 of out w 32768 Value controlling output put 1 r 32767 1 point X2 x100 4010 Y2 of out w 32768 6 Expected value
5. moment of drying up the sensor structure 2 The absolute temperature measurement range is 30 85 C but the measurement class is not guaranteed beyond the basic range 3 Admissible condensation of water vapor when using additional sensor shields see Tab 9 4 For air flow lt 0 5 ms the temperature and humidity measurement error may increase by 100 40 7 ORDERING CODE P18 D Analog outputs sensor without outputs sensor on the housing current 4 20 mA sensor on the housing voltage 0 10V sensor on the housing without outputs probe on the wire 0 5 m current 4 20 mA probe on the wire 0 5 m voltage 0 10V probe on the wire 0 5 m Version standard custom made Acceptance tests Without extra quality requirements With quality inspection certificate Acc to customer s request after agreeing with the manufacturer Code example Table 10 P18D 100E1 means the P18D transducer standard version with the sensor on the housing with analog current output English language with quality inspection certificate 41 42 43 P18 09C LUMEL LUMEL S A ul S ubicka 1 65 127 Zielona G ra Poland Tel 48 68 45 75 100 Fax 48 68 45 75 508 e mail lumelQ lumel com pl http www lumel com pl Export Department Tel 48 68 45 75 302 Fax 48 68 32 54 091 e mail export lumel com pl
6. supply the transducer is ready to work with manufacturer s settings Tab 4 The transducer can be programmed through the RS 485 interface You can program following parameters in the transducer communication parameters averaging time of the measurement individual characteristics of analog outputs for executions with analog outputs The P18D transducers allow programming communication parame ters address baud rate mode using the capacitive button There is the possibility to connect the transducer through another trans mission media like ETHERNET USB using LUMEL S A s converters 5 1 Power on messages of the P18D transducer After connecting the external signals and connecting to the supply the transducer displays the type current program version serial number and set communication parameters address baud rate and operating mode The transmitter automatically switches to the operating mode of me asurement and processing the analog output signal after approx 5 se conds It displays the measuring value with the unit in the bottom line of the display the top line of the display contains information about the type of displayed quantity and the pictograms of transmission via RS 485 the presentation mode of the measuring value the read pointer of the measuring value of the sensor and the operating state of the internal heater 11 5 2 Description of the P18D transducer readout field The illumi
7. 7501 1DB1 7502 check ction dress bytes B3 B2 B1 BO sum 01h 03h 08h 41h CDh 70h A4h 41h A2h 00h 00h 83D0h Single register writing code 06h Example 2 Writing the value 78h 120 to the register FA1h 4001 Request q Table 7 Device l Register address Register value CRC address ancien checksum B1 BO B1 BO 01h 06h OFh Ath 00h 78h DB1Eh Response Table 8 Device f Register address Register value CRC address ne checksum B1 BO B1 BO 01h 06h OFh Ath 00h 78h DB1Eh 24 Writing n registers code 10h Example 3 Writing the value 78h 120 and the value 4h 4 to the regi sters FA1h FA2h 4001 4002 Request Table 9 De p Register Register vice Fun Register Number of beret 100 Han CRC ad ction address registers bytes check dress Bi Bo B1 Bo sum 01h 10h OFh Ath 00h 78h 04h 00h 78h 00 04 F831h Response Table 10 Device f Register address Number of registers CRC address Function checksum B1 BO B1 BO 01h 10h OFh Ath 00h 02h 133Eh Device identification report code 11h Example 4 Device identification Request Table 11 Device Function Checksum address Oth 11h C02Ch Response Table 12 Device Num Identi De The field depending on the CRC Fun i ad ction ber of fier vice device sof
8. TEMPERATURE AND HUMIDITY TRANSDUCER P18 D TYPE USER S MANUAL C Contents T APPLICATION as sents cnc e ana aaaea eE raaa Ea iaa iy 5 2 TRANSDUCER SED eesccsecitsvccesinescccssschicseccevanseesecedtserecctsiescesevanyds 7 3 BASIC REQUIREMENTS OPERATIONAL SAFETY 7 4 INSTALLATION oeccecscecceescessccsctsacessecatcectestiscenvaccestseestesecianeseaeat canes 7 Az Way Of MIXING iss supe Ea RE OP vine ery zp ENOCE IES 7 4 2 External connection diagrams ccccceeeeceeeeeeeeeesteeeeeneees 9 5 SERVIC Ehuna na a drawn EASY 11 5 1 Power on messages of the P18D transducer 11 5 2 Description of the P18D transducer readout field 12 5 3 Functions of the P18D transducer capacitive button 13 5 4 Programming parameters menu of the P18D transducer 14 5 5 Functions of the P18 D transducer 5 5 1 Calculated ValS Sissons ats 5 5 2 Selection of controlling values for analog outputs 16 5 5 3 Individual characteristic of analog outputs 17 5 5 4 Support of a sensor heater siiin 19 5 05 90 Default Setting Sidiria ea visi R ates 20 6 RS 485 INTERFACE nz zaocznie EEEE 21 6 1 Connection of the serial interface 111 12 21 6 2 Description of the MODBUS protocol implementation 23 6 3 Description of the functions used 21112 111 23 6 4 Map f t
9. ayed information of the transmission parameters in the P18D transmitter menu 14 Confirmation 1 of changes A J ape Measurement 5 seconds Application of changes A A 5 seconds seconds Mode programming A Baud rate programming A Address programming 5 seconds 5 seconds a L 14 decreasing the value increasing the value increase decrease the value increase decrease the value increase decrease the value Fig 10 Programming parameters algorithm of the P18D transducer 5 5 Functions of the P18 D transducer The P18 D transducer carries out the functions measurement of the ambient temperature and relative humidity e calculation of chosen physical quantities dew point temperature absolute humidity wet bulb temperature conversion of measured values into an output signal on the base of the individual linear characteristic 2 configurable analog outputs optional memory storage of maximal and minimal values for each of the measured and calculated value programming of the measurement averaging time e RS 485 interface servicing in the MODBUS protocol in RTU mode e Displaying measuring and calculated values only P18D 15 5 5 1 Calculated values Based on the measurement of a temperature and relative humidity the P18D transducer calculates dew point and absolute humi dity of the fol
10. bility of water vapor condensa tion depending of the transducer working conditions Table 18 A S Order code Dr a Name Design Features Typical appli wing cations 1 0874 490 016 L PCV ho Average effe Building auto 2 using PTFE ct of filtration mation for use gt membrane maximal tem in the rooms S with a lami perature up to with small pol 5 nated film 800C respon lution pore size se time t10 90 2 1 um 15s 2 0874 490 015 Sintered High chemical Drying process PTFE pore resistance ma in chemical ap S size 50 um ximaltemperatu plications re up to 180 C ira response time E t10 90 14 s 3 0874 490 014 5 Sintered High mechani Agriculture E bronze cal resistance N pore size used in high fo 60 um pollution and low humidity o response time 2 110 90 10 s 2 38 6 TECHNICAL DATA Basic parameters range of relative humidity measurement RH 0 100 without condensation basic error of humidity conversioni 2 of the range for RH 10 90 3 for the remaining range hysteresis of the humidity measurement 1 RH basic range of temperature measurement T 20 60 C basic error of temperature conversion 0 5 of the range for the versions with analog outputs P18 D 1 P18 D 2 P18 D 4 or P18 D 5 a basic error of temperature conversion may increase by 0 2 C calculated values a
11. bsolute humidity a g m dew point temperature Td C additional errors temperature influence 25 of the basic error 10 C RS 485 digital output transmission protocol MODBUS baud rate 4800 9600 19200 38400 57600 bit s mode RTU 8N2 8E1 801 8N1 max response time 300 ms Analog outputs current 4 20 mA voltage 0 10 V max load resistance of the current output 100 Q min load resistance of the voltage output 1 KQ 39 Rated operating conditions supply power consumption ambient temperature relative air humidity rate of air flow preheating time protection grade ensured by the housing fixing weight dimensions working position 9 24 V a c d c lt 0 5 VA 20 23 60 C lt 95 3 gt 0 5 m s 15 minutes IP 65 on a wall 125g 35 x 58 x 118 mm e in applications non exposed to a direct contact with water any e in applications exposed to a direct contact with water with the sensor chamber directed towards the ground Electromagnetic compatibility noise immunity noise emission acc to EN 61000 6 2 acc to EN 61000 6 4 Safety requirements acc to EN 61010 1 installation category pollution grade phase to earth operating voltage altitude above sea level III 2 50 V lt 2000 m 1 In case of condensation of water vapor on the sensor surface the measurement error may exceed the basic error till a
12. e the defaults settings After removing the jumper the transducer returns to previous settings or to settings changed during the operation with the jumper Fig 13 Placement of the jumper setting temporary communication parameters 36 7 ERROR CODES The error messages could be displayed on the transducer P18D display during operation The table below lists the error codes which are possible to be displayed and their reasons as well as the recommended user responses Information about the existing errors is also available in the P18 D transducers status register register 4017 Table 17 Message bit no reg Status reg 4017 Description Error 7 Sensor failure transmitter should be Sensor returned to a service Error 14 Loss of calibration parameters loss Calibr of efficiency of the analog outputs measurements are correct returning a transmitter to a service should be considered Error 13 Loss of transmitter settings XX Param XX number of a parameter register number 40XX configured incorrectly correct value should be written to the register 40XX or default settings restored 37 8 ACCESSORIES As a standard the P18 D transducer is equipped with a shield of the sensor destined only for indoors applications It is recommended to use additional shields of the sensor interchangeable for outdoors or indoors applications exposed to the possi
13. ential terminals can not be connec ted together analog voltage outputs have a common low potential low potential terminals can be connected together 18 5 5 4 Support of a sensor heater The sensors used in the P18 D transducers are equipped with internal heating elements to allow faster release of water molecu les from the sensor being flooded or working a long time in highly hu mid environments Switching the heater on is possible by writing the appropriate value to the register 4021 see Tab 14 Status of the heater is available in the status register register 4017 at the bit position 11 if the bit 11 of the register 4017 is set to 1 this means that the heater is switched on Caution The transducer with a heating element switched on does not measure the proper ambient temperature and humidity the temperature mea sured by the sensor increases and the humidity decreases The value 200 is added to the measuring values temperature relative humidity when using the transducer with the heater switched on in order to avoid distortions of a measurement in the measurement systems The P18D transducers working with a heating element swit ched on display a flashing symbol h Fig 12 Indication of the P18D transducer operation with a heater switched on 19 5 5 5 Default settings The Table 4 shows the standard settings of the P18D transdu cer The settings can be restored via the RS 485 interface after
14. ers with the probe on the wire 0 5 m 2 TRANSDUCER SET Transducer 1 pc User s manual 1 pc Warranty card 1 pc 3 BASIC REQUIREMENTS OPERATIONAL SAFETY In terms of operational safety the transducer meets the requirements of the EN 61010 1 standard Comments concerning safety AN e Assembly and installation of the electrical connections should conducted only by people authorised to perform assembly of elec tric devices e Always check the connections before turning the transducer on The transducer is designed to installation and usage in the indu strial electromagnetic environment 4 INSTALLATION 4 1 Assembly The P18 D transducer is designed to be mounted on a wall by means of a screw connection or glue without the loss of IP65 tightness The transducer housing is made of a self extinguishing plastics The trans ducer has screw connectors placed inside the transducer which enable the connection of external wires of 1 mm cross section Fig 3 Overall dimensions of the P18 D transducer mounting holes Fig 4 Lay out of mounting holes of the P18 D transducer 4 2 External connection diagrams The P18 D transducer version P18 D 1XXX or P18 D 2XXX has 8 connecting terminals version P18 D 0XXX has 4 terminals ver sion without analog outputs Access to the terminals is possible after removing the cover of the transducer housing You should use a multi conductor rou
15. he registers aaa O p AO 26 6 5 Registers for writing and readout ee seaaaaaeuua 27 6 6 Registers for TEadOUll sace ccsssencssecavveseresesearteyssnraanrecsaveesectes seas 33 6 7 Emergency restoration of default parameters 36 7 ERROR CODES 8 ACCESSORIES 9 TECHNICAL DATA 2 2 seseassa ana az oaza az aaa ana az nana azzaaz nawa 002 39 10 ORDERING CODE 2 2 4 snnan ana ana aranz nara azaazaaaz niz aadne 41 1 APPLICATION The P18 and P18D transducers are the devices destined for the continuous measurement and conversion of relative humidity and ambient temperature into a digital form and into a voltage or cur rent standard signal The transducers are fixed on a wall Programming of the transmitters is possible via the RS 485 interface LPCon or eCon software designed for configuration of the transducers is available on the manufacturers website www lumel com pl Applied sensor shields enable the application of the transducers in various ambient conditions Oris tay O Fig 1 Overview of the P18 and P18D transducers with the probe on the housing O maD we O cH oe CEZA g lt xI co w U Fig 2 Overview of the P18 and P18D transduc
16. lowing dependencies d DP dwe point DP m 1 log P _ RA _ 10000 A DP absolute humidity AH 9 1668 Pa PE 100 T 273 2 gdzie T measured temperature C RH measured absolute humidity DP dew point temperature C P saturated water vapor pressure water vapor pressure mbar AH absolute humidity g m Table 2 The factors used to calculate the dew point T C A m T lt 0 6 119866 7 926104 250 4138 0 50 6 1078 7 5 237 3 50 100 5 9987 7 3313 229 1 5 5 2 Selection of controlling values for analog outputs The P18 D transducers in versions P18 D 1XX P18 D 2XX P18 D 4XX P18 D 5XX are equipped with two programmable analog outputs voltage or current By default the first analog output is set for a presentation of the ambient temperature and the second analog output is controlled by the value of the relative humidity The ana log outputs can respond to any of the measuring or calculated values 16 T RH DP AH wet bulb temperature The value controlling the analog outputs is defined by the registers respectively 4015 for the first output and 4016 for the second analog output Tab 14 5 5 3 Individual characteristic of analog outputs The P18 D transducers in the version with analog outputs enable the conversion of measured values into an output signal ba sed on the strength of individual linear characteristic of analog outp
17. nated character LCD is a readout field in the trans ducer P18D The illumination is turned on after switching on the supply and after the capacitive button on the housing is pressed The illumina tion is automatically switched off after 30 sec of inactivity Indicator of the measuring value from the sensor Indicator of automatic presenta Type of the displayed va tion of the measuring values Transmission indicator on RS 485 link Unit of the displayed value Value of the displayed value Fig 7 Description of the P18D transducer readout field Description of the symbols displayed by the P18D transducer is in the Table 1 Table 1 Symbol Meaning 1 Type of the displayed value in the bottom line of the LCD temperature RH Type of the displayed value in the bottom line of the LCD relative humidity 12 DP Type of the displayed value in the bottom line of the LCD dew point AH Type of the displayed value in the bottom line of the LCD absolute humidity The indicator of the measuring value from the sensor Automatic mode of measurement results presentation a type of displayed value is automatically switched every 3 seconds in the following order temperature gt relative humidity dew point gt absolute humidity gt temperature Data receiving indicator by the P18D transducer on RS 485 Data sending indicator by the P18D_ transducer
18. nd wire with external diameter from 3 5 mm up to 6 mm for electrical connections Remove the display prior to connecting the wires in a screw terminal of the P18D transducer Pass supplying wi res through the packing and twist the packing seal in order to obtain the leaktightness If the packing seal is not twisted the required IP 65 leaktightness is not ensured The LCD display should be put back after screwing the wires to the screw terminal of the P18D transducer Fig 5 Marking of the terminals for the connection of external signals of the P18 D transducers in versions a without analog outputs b with analog outputs EE 314 Lo B A 9 24V RS 485 a c d c Transducer without analog outputs Ly lle RS 485 Transducer with current outputs Transducer with voltage outputs ee elle 485 Fig 6 Wiring diagram of the P18 D transducer with analog outputs Use shielded cable for supply and output signals in environ ments with high levels of interference The shield must be connected to the nearest PE point from the feeder side 10 5 SERVICE The P18D transducer is equipped with a display field 8x2 characters with illumination and one capacitive button located on the housing The P18 transducer is not equipped with a display or a button After connecting the wires closing and servicing the housing and connecting to the
19. of put 1 r 32767 2 output 1 for point X2 p ZS 4011 X1 of out wl 32768 6 Value controlling output put 2 r 32767 D 2 point X1 x100 4012 Y1 of out w 32768 S Expected value of put 2 r 32767 output 2 for point X1 G 4013 X2 of out w 32768 3 Value controlling output put 2 r 32767 2 point X2 x100 4014 Y2 of out w 32768 Expected value of out put 2 r 32767 put 2 for point X2 4015 Value w 0 3 Va Description controlling r lue 1 analog 0 Temperature output Relative humidity 28 2 Dew point Absolute humidity 4 Wet bulb tempera ture 4016 Value w 0 3 Va Description controlling r lue analog 0 Temperature output 1 Relative humidity 2 Dew point 3 Absolute humidity 4 Wet bulb tempera ture 4017 Status w 32768 Transducer status Shows r 32767 the current state of the trans ducer and the hardware con figuration Successive bits represent the event Bit set to 1 indicates that the event took place Bit15 Restart of the supp ly writing the value 32768 8000h will clear the status bit Bit14 Error of the calibra tion parameters Bit13 Error of the transmit ter settings enter the new settings 29 Bit12 not used Bit11 Indicator of switching the heater on Bit10 Indicator of erasing the extremes writing the
20. rsions with analog outputs the RS 485 interfa ce is not isolated from the supply or from the analog outputs 6 1 Connection of the serial interface Standard RS 485 allows a direct connection up to 32 devices on a single serial link to a length of 1200 m at baud rate 9600 b s It is necessary to use additional intermediate separation circuits for con necting higher number of the devices for example PD51 manufactured by LUMEL S A 21 Output of the interface line is shown in Fig 6 It is required to con nect the lines A and B in parallel with their equivalents in other devices to obtain the correct transmission The connection must use a shielded wire The cable shield should be connected to the protective terminal in close proximity to the transmitter connect a shield to the protective terminal at one point only RS 485 interface card or the converter is required for a connection to a PC for example PD10 The method of connecting devices is shown in Fig 13 Opie mu A A EH XAR B B 15 7 x o CEZA o Ops mu A H FAR 5 Ea fo CEZA o Opsp tm A RH AR B 15 7 CEZA o santeti i Fig 13 Connecting the RS 485 interface 22 6 2 Description of the MODBUS protocol implementation The implemented protocol is compliant with the PI MBUS 300 Rev G specifica
21. tion of Modicon Set of parameters of the P18D transducer serial link in the MODBUS protocol Transducer address 1 247 e Baud rate 4800 9600 19200 38400 57600 115200 b s Operating mode RTU frame format 8N2 8E1 801 8N1 Maximum response time 500 ms Configuration of the serial link parameters consists of determining the baud rate the device address and the format of the transmission mode protocol Caution Each transmitter connected to the communication network must have a unique address different from the addresses of other devi ces connected to the network Identical baud rate and type of a transmission mode 6 3 Description of the functions used Following functions of the MODBUS protocol have been implemented in P18D transducers 03 03h readout of registers group 04 04h readout of input registers group 06 06h single register writing 16 10h registers group writing 17 11h slave device identification 23 Readout of n registers code 03h Example 1 Readout of 2 registers starting with the register address 1D4Dh 7501 float 32 bit register values 25 68 20 25 Request Table 5 Device i Register address Number of registers CRC check address Function sum B1 BO B1 BO 01h 03h 1Dh 4Dh 00h 02h 5270h Response P Table 6 Device 7 Num Value from the register Value from the register CRC ad u berof 1DBO
22. tware version check dress bytes P18D status e g 0 70 sum 50h 31h 38h 44h 76h 2Eh B154h a gi DEN cCh FFh 30h 2Eh 30h 34h 20h 00h 25 6 4 Map of the registers In the P18D transducer data are placed in 16 and 32 bit registers Process variables and transducer parameters are placed in the address area of registers in a way depended on the variable value type Bits in 16 bit registers are numbered from the youngest to the oldest bO b15 The 32 bit registers 4 bytes contain numbers of float type in IEEE 754 standard Bytes sequence B3 B2 B1 BO the oldest byte is transmitted as the first A following map is the map of P18 D transducers registers Caution All listed addresses are physical addresses Some computer programs use logic addressing then the addresses should be increased by 1 Table 13 Address range Value type Description 4000 4022 integer 16 bits The value is located in the 16 bit register 6000 6030 float 32 bits Value set in the two following 16 bit registers These registers contain the same data as 32 bit registers from 7500 7515 range Readout registers Bytes sequence B1 B0 B3 B2 7000 7030 7500 7515 float 32 bits float 32 bits Value set in the two following 16 bit registers These registers contain the same data as 32 bit registers from 7500 7515 range Readout registers Bytes sequence B3 B2 B1 B0 The value
23. uts On the base of given coordinates of two points by the user the trans ducer determines from the system of equations coefficients a and b of the individual characteristic Ta a Xlin b Y2out a X2in b where Xlin and X2 in displayed value YI out and Y2 out oexpected value of the analog output Quantity on the analog output Any slop of i R characteristic Y2 Out widowni Y1 Out Any shift of the characteristic gt X1 In X2 In Measured quantity Fig 11 Individual characteristic of analog output 17 The configuration of the individual characteristic of analog outputs amounts to the introduction of suitable values X1 X2 Y1 Y2 in corresponding registers to them from the range 4007 4014 Tab 3 The values introduced in these registers must be integral values corre sponding to the set point values multiplied by the value 100 Example 1 Configuration of the individual characteristic of the first analog current output temperature Expected processing temperature in the range 12 25 C 77 75 C to the analog current signal in the range 4 5 mA 18 5 mA Table 3 Name Register address Value X1 temperature 4007 1225 Y1 current 4008 450 X2 temperature 4009 7775 Y2 current 4010 1850 Caution The analog outputs are not isolated from the supply the RS 485 interface and each other the analog current outputs don t have a common potential low pot
24. value 1024 400h erases the status bit Bit9 Temporary commu nication parameters are set shorten jum per ZW Bit8 LCD display error Bit7 Error reading the va lue from the sensor Bit5 Value controlling 2 analog output 00 01 10 temperature relative humidity dew point absolute humidity Bit3 Value controllin analog output Q 00 01 10 temperature relative humidity dew point absolute humidity 30 Bit2 results averaging in terval has ended Bit1 The transducer is equi pped with the analog outputs voltage BitO The transducer is equi pped with the analog outputs current 4018 Software version 1 999 Software version x100 4019 Custom configura tion wi 0 31 Bito Value Descrip tion 0 The stan dard map of the re gisters in the range 7000 and 7500 1 Map of the regi sters in the ran ge 7500 and 7000 compliant with the map of the P14W transdu cers Bit1 Number of characters of a response delay to the query for the RS 485 transmission 31 4020 Default w Va Description settings r lue 0 no change 1 przywraca parametry fabryczne 4021 Controlling Va Description the heater lue 0 switching a heater off 1 permanent switching a heater on
25. writing the value 1 to the registry 4020 20 Table 4 Para Standard value Parameter Tail meter P18D 0XX P18D 1XX P18D 2XX description address P18D 3XX P18D 4XX P18D 5XX Address 4001 1 Baud rate 4002 9600 Mode 4003 RTU 8N2 Averaging time 4005 30 s X1 of the 1st 4007 0 2000 2000 analog output Y1 of the 1st 4008 0 400 0 analog output X2 of the 1st 4009 0 6000 6000 analog output Y2 of the 1st 4010 0 2000 1000 analog output X1 of the 2nd 4011 0 0 0 analog output Y1 of the 2nd 4012 0 400 0 analog output X2 of the 2nd 4013 0 10000 10000 analog output Y2 of the 2nd 4014 0 2000 1000 analog output Value control 4015 0 0 0 ling the first analog output Value control 4016 1 1 1 ling the second analog output Custom confi 4019 8 8 8 guration 6 RS 485 INTERFACE The P18 D programmable digital transducers have a serial link RS 485 for communication in the computer systems and with other de vices that serve as a Master Asynchronous character MODBUS com munication protocol has been implemented in a serial link The transmis sion protocol describes how to exchange information between devices via a serial link Caution For the transmitter versions without analog outputs P18 D OXX and P18 D 3XX the RS 485 interface is galvanically isolated from the supply 1 kV separation For the transmitter ve
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